deep tendon reflex (DTR)

Introduction

Activation of muscle stretch receptors by percussing the tendon of a muscle.

Grading:

0+ none

1+ hypoactive

2+ normal

3+ slightly brisk compared to normal

4+ hyperactive

Reflex Nerve Root(s) Muscle

biceps C5-C6 biceps

triceps C7-C8 triceps

knee L2-L4 quadriceps

ankle S1 gastrocnemius

More general terms

• reflex

More specific terms

• hyperreflexia
• hyporeflexia